Lamp



FIG. 1 is a front elevational view of our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left side elevational view, the right side elevational view being a mirror image thereof.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 